package cj.utils;

import java.security.MessageDigest;  
import java.security.NoSuchAlgorithmException; 

public class MD5Security {
	private final static char[] hexDigits = { '0', '1', '2', '3', '4', '5',
			'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

	private static String bytesToHex(byte[] bytes) {
		StringBuffer sb = new StringBuffer();
		int t;
		for (int i = 0; i < 16; i++) {
			t = bytes[i];
			if (t < 0)
				t += 256;
			sb.append(hexDigits[(t >>> 4)]);
			sb.append(hexDigits[(t % 16)]);
		}
		return sb.toString();
	}

	public static String md5(String input) throws Exception {
		return code(input, 32);
	}

	public static String code(String input, int bit) throws Exception {
		try {
			MessageDigest md = MessageDigest.getInstance(System.getProperty(
					"MD5.algorithm", "MD5"));
			if (bit == 16)
				return bytesToHex(md.digest(input.getBytes("utf-8")))
						.substring(8, 24);
			return bytesToHex(md.digest(input.getBytes("utf-8")));
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			throw new Exception("Could not found MD5 algorithm.", e);
		}
	}

	public static String md5_3(String b) throws Exception {
		MessageDigest md = MessageDigest.getInstance(System.getProperty(
				"MD5.algorithm", "MD5"));
		byte[] a = md.digest(b.getBytes());
		a = md.digest(a);
		a = md.digest(a);

		return bytesToHex(a);
	}
	
	/**
     * 返回种植的加密密文
     * @param account		加密方式	MD5(account+singKey)
     * @return
     * @throws Exception 
     */
    public static String returnSingKey(String account) throws Exception
    {
    	//加密Key
    	final String singKey = "_lkgAppNews";
    	//原始秘要
    	String token =account+singKey;
    	//加密后  秘要
    	token = MD5Security.md5(account+singKey);
    	
		return token;
    }
    
    public static void main(String[] args) throws Exception{
    	final String singKey = "E_E_CJAPP"+"founder";
    	
    	String token = MD5Security.md5(singKey);
    	
    	System.out.println("http://remote.app.cjdaily.cjrbapp.cjn.cn/cjdaily/api/getcolumn?token="+token);
    }
}
